Impedance data from patients with asthma (left) and COPD (right) according to severity of underlying disease. Impedance data from patients with asthma.

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Presentation transcript:

Impedance data from patients with asthma (left) and COPD (right) according to severity of underlying disease. Impedance data from patients with asthma (left) and COPD (right) according to severity of underlying disease. Notice the consistent relationship between diseases of the changes in respiratory system resistance (RRS) and respiratory system reactance (XRS) with increasing severity. In both cases, as severity increases, RRS rises and becomes more frequency dependent, especially at lower frequencies (< ∼16 Hz), and XRS falls to more negative values, with an increase in the resonant frequency (point at which XRS crosses zero). (Left from Reference 47, with permission. Right from Reference 48, with permission.)‏ David A Kaminsky Respir Care 2012;57:85-99 (c) 2012 by Daedalus Enterprises, Inc.